By GP CHIUSOLI* and G. COMETTI (Centro Ricerclze di Chimica Organicn Montedison, Via del Lavovo 3, Novava, Italy) ... Szsiiziizary Insertion of olefins between an allyl group and carbon monoxide gives acids or esters in the presence of water or alcohols, respectively. ... WE have extended our studies1 $2 on insertion reactions with olefins and have found that under pressure ethylene under- goes reactions of type (1) in protic solvents at 40-80". Thus, reaction (1) ...